[Qemu-devel] [PATCH COLO-Frame v7 21/34] COLO NIC: Init/remove colo nic devices when add/cleanup tap devices

[zhanghailiang <zhang.zhanghailiang@huawei.com>]

When go into COLO mode, we need to some init work for all VM's nics.
Here we use a list to record these nic, and for now we only support
the 'tap' nic backend.

Cc: Stefan Hajnoczi <stefanha@redhat.com>
Cc: Jason Wang <jasowang@redhat.com>
Signed-off-by: zhanghailiang <zhang.zhanghailiang@huawei.com>
Signed-off-by: Li Zhijian <lizhijian@cn.fujitsu.com>
---
 include/net/colo-nic.h |  5 ++++
 net/Makefile.objs      |  1 +
 net/colo-nic.c         | 62 ++++++++++++++++++++++++++++++++++++++++++++++++++
 net/net.c              |  2 ++
 net/tap.c              | 12 ++++++----
 stubs/migration-colo.c |  9 ++++++++
 6 files changed, 86 insertions(+), 5 deletions(-)
 create mode 100644 net/colo-nic.c

diff --git a/include/net/colo-nic.h b/include/net/colo-nic.h
index 3075d97..3941b6e 100644
--- a/include/net/colo-nic.h
+++ b/include/net/colo-nic.h
@@ -14,10 +14,15 @@
 #ifndef COLO_NIC_H
 #define COLO_NIC_H
 
+#include "migration/colo.h"
+
 typedef struct COLONicState {
     char nicname[128]; /* forward dev */
     char script[1024]; /* colo script */
     char ifname[128];  /* e.g. tap name */
 } COLONicState;
 
+void colo_add_nic_devices(COLONicState *cns);
+void colo_remove_nic_devices(COLONicState *cns);
+
 #endif
diff --git a/net/Makefile.objs b/net/Makefile.objs
index ec19cb3..73f4a81 100644
--- a/net/Makefile.objs
+++ b/net/Makefile.objs
@@ -13,3 +13,4 @@ common-obj-$(CONFIG_HAIKU) += tap-haiku.o
 common-obj-$(CONFIG_SLIRP) += slirp.o
 common-obj-$(CONFIG_VDE) += vde.o
 common-obj-$(CONFIG_NETMAP) += netmap.o
+common-obj-$(CONFIG_COLO) += colo-nic.o
diff --git a/net/colo-nic.c b/net/colo-nic.c
new file mode 100644
index 0000000..b6a8330
--- /dev/null
+++ b/net/colo-nic.c
@@ -0,0 +1,62 @@
+/*
+ * COarse-grain LOck-stepping Virtual Machines for Non-stop Service (COLO)
+ * (a.k.a. Fault Tolerance or Continuous Replication)
+ *
+ * Copyright (c) 2015 HUAWEI TECHNOLOGIES CO., LTD.
+ * Copyright (c) 2015 FUJITSU LIMITED
+ * Copyright (c) 2015 Intel Corporation
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or
+ * later.  See the COPYING file in the top-level directory.
+ *
+ */
+#include "include/migration/migration.h"
+#include "migration/colo.h"
+#include "net/net.h"
+#include "net/colo-nic.h"
+#include "qemu/error-report.h"
+
+typedef struct nic_device {
+    COLONicState *cns;
+    int (*configure)(COLONicState *cns, bool up, int side, int index);
+    QTAILQ_ENTRY(nic_device) next;
+    bool is_up;
+} nic_device;
+
+QTAILQ_HEAD(, nic_device) nic_devices = QTAILQ_HEAD_INITIALIZER(nic_devices);
+
+void colo_add_nic_devices(COLONicState *cns)
+{
+    struct nic_device *nic;
+    NetClientState *nc = container_of(cns, NetClientState, cns);
+
+    if (nc->info->type == NET_CLIENT_OPTIONS_KIND_HUBPORT ||
+        nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
+        return;
+    }
+    QTAILQ_FOREACH(nic, &nic_devices, next) {
+        NetClientState *nic_nc = container_of(nic->cns, NetClientState, cns);
+        if ((nic_nc->peer && nic_nc->peer == nc) ||
+            (nc->peer && nc->peer == nic_nc)) {
+            return;
+        }
+    }
+
+    nic = g_malloc0(sizeof(*nic));
+    nic->configure = NULL;
+    nic->cns = cns;
+
+    QTAILQ_INSERT_TAIL(&nic_devices, nic, next);
+}
+
+void colo_remove_nic_devices(COLONicState *cns)
+{
+    struct nic_device *nic, *next_nic;
+
+    QTAILQ_FOREACH_SAFE(nic, &nic_devices, next, next_nic) {
+        if (nic->cns == cns) {
+            QTAILQ_REMOVE(&nic_devices, nic, next);
+            g_free(nic);
+        }
+    }
+}
diff --git a/net/net.c b/net/net.c
index 6ff7fec..8e9c719 100644
--- a/net/net.c
+++ b/net/net.c
@@ -284,6 +284,7 @@ static void qemu_net_client_setup(NetClientState *nc,
         peer->peer = nc;
     }
     QTAILQ_INSERT_TAIL(&net_clients, nc, next);
+    colo_add_nic_devices(&nc->cns);
 
     nc->incoming_queue = qemu_new_net_queue(nc);
     nc->destructor = destructor;
@@ -359,6 +360,7 @@ void *qemu_get_nic_opaque(NetClientState *nc)
 static void qemu_cleanup_net_client(NetClientState *nc)
 {
     QTAILQ_REMOVE(&net_clients, nc, next);
+    colo_remove_nic_devices(&nc->cns);
 
     if (nc->info->cleanup) {
         nc->info->cleanup(nc);
diff --git a/net/tap.c b/net/tap.c
index ad99fe3..c2135cd 100644
--- a/net/tap.c
+++ b/net/tap.c
@@ -41,6 +41,7 @@
 #include "qemu/error-report.h"
 
 #include "net/tap.h"
+#include "net/colo-nic.h"
 
 #include "net/vhost_net.h"
 
@@ -627,7 +628,8 @@ static void net_init_tap_one(const NetdevTapOptions *tap, NetClientState *peer,
                              const char *model, const char *name,
                              const char *ifname, const char *script,
                              const char *downscript, const char *vhostfdname,
-                             int vnet_hdr, int fd, Error **errp)
+                             int vnet_hdr, int fd, bool setup_colo,
+                             Error **errp)
 {
     Error *err = NULL;
     TAPState *s = net_tap_fd_init(peer, model, name, fd, vnet_hdr);
@@ -773,7 +775,7 @@ int net_init_tap(const NetClientOptions *opts, const char *name,
 
         net_init_tap_one(tap, peer, "tap", name, NULL,
                          script, downscript,
-                         vhostfdname, vnet_hdr, fd, &err);
+                         vhostfdname, vnet_hdr, fd, true, &err);
         if (err) {
             error_propagate(errp, err);
             return -1;
@@ -823,7 +825,7 @@ int net_init_tap(const NetClientOptions *opts, const char *name,
             net_init_tap_one(tap, peer, "tap", name, ifname,
                              script, downscript,
                              tap->has_vhostfds ? vhost_fds[i] : NULL,
-                             vnet_hdr, fd, &err);
+                             vnet_hdr, fd, false, &err);
             if (err) {
                 error_propagate(errp, err);
                 return -1;
@@ -850,7 +852,7 @@ int net_init_tap(const NetClientOptions *opts, const char *name,
 
         net_init_tap_one(tap, peer, "bridge", name, ifname,
                          script, downscript, vhostfdname,
-                         vnet_hdr, fd, &err);
+                         vnet_hdr, fd, false, &err);
         if (err) {
             error_propagate(errp, err);
             close(fd);
@@ -895,7 +897,7 @@ int net_init_tap(const NetClientOptions *opts, const char *name,
             net_init_tap_one(tap, peer, "tap", name, ifname,
                              i >= 1 ? "no" : script,
                              i >= 1 ? "no" : downscript,
-                             vhostfdname, vnet_hdr, fd, &err);
+                             vhostfdname, vnet_hdr, fd, i == 0, &err);
             if (err) {
                 error_propagate(errp, err);
                 close(fd);
diff --git a/stubs/migration-colo.c b/stubs/migration-colo.c
index 2f0b455..91f35e9 100644
--- a/stubs/migration-colo.c
+++ b/stubs/migration-colo.c
@@ -12,6 +12,7 @@
 
 #include "migration/colo.h"
 #include "qmp-commands.h"
+#include "net/colo-nic.h"
 
 bool colo_supported(void)
 {
@@ -37,6 +38,14 @@ void *colo_process_incoming_checkpoints(void *opaque)
     return NULL;
 }
 
+void colo_add_nic_devices(COLONicState *cns)
+{
+}
+
+void colo_remove_nic_devices(COLONicState *cns)
+{
+}
+
 void qmp_colo_lost_heartbeat(Error **errp)
 {
     error_setg(errp, "COLO is not supported, please rerun configure"
-- 
1.7.12.4